2,6-Dichlorophenol is a compound with formula C<sub>6</sub>H<sub>3</sub>Cl<sub>2</sub>OH. It is one of the six isomers of dichlorophenol. It is a colorless solid. Its pK<sub>a</sub> is 6.78, which is about 100x more acidic than 2-chlorophenol (8.52) and 1000x more acidic than phenol itself (9.95).
It can be produced in a multistep process from phenol, which is converted to its 4-sulfonic acid derivative. The resulting phenol sulfonic acid chlorinates at the positions flanking the phenol. Hydrolysis releases the sulfonic acid group.
An alternative synthesis starts with the ethyl ester of 4-hydroxybenzoic acid, which chlorinates at the positions flanking the phenolic center. Ester hydrolysis followed by decarboxylation affords 2,6-dichlorophenol.